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The oxygen atom with the negative charge on the acetate ion is said to be sp2 hybridised but I can seem to figure out how

I feel I may not have out much effort into this question so even a link to a useful website where I can learn how to find hybridizations for atoms other than the central atom will be much appreciated.

Chemistry is hard :(

Glowingbluejuicebox
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    The oxygen atoms in the acetate ion are identical. The fact that we draw them differently just reflects the inherent imperfection of our language. – Ivan Neretin Jan 28 '21 at 07:33
  • Somehow I doubt that knowledge that both oxygen atoms are in practice rather sp hybridised won't help you. And that "are" part should be more like can be described using such approximation, if hybridisation is even used on occasion. – Mithoron Jan 28 '21 at 20:16
  • related: https://chemistry.stackexchange.com/a/9740/102629 – cngzz1 Jan 30 '21 at 11:00

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Oxygen atom in the acetate ion is $\ce{sp^2}$ hybridized because as @Ivan Neretin said in comments, both the atoms are identical because the negative charge is in resonance with the $\pi$ bond of the other oxygen atom and thus it has to be $\ce{sp^2}$ hybridized to show resonance.

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V.G
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